/*
 * CCVisu is a tool for visual graph clustering
 * and general force-directed graph layout.
 * This file is part of CCVisu.
 *
 * Copyright (C) 2005-2012  Dirk Beyer
 *
 * CCVisu is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * CCVisu is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with CCVisu; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Please find the GNU Lesser General Public License in file
 * license_lgpl.txt or http://www.gnu.org/licenses/lgpl.txt
 *
 * Dirk Beyer    (firstname.lastname@uni-passau.de)
 * University of Passau, Bavaria, Germany
 */
package org.sosy_lab.ccvisu.measuring.calldep;

import org.sosy_lab.ccvisu.graph.GraphEdge;
import org.sosy_lab.ccvisu.graph.GraphVertex;

public class DistanceVertexContainer extends AbstractVertexContainer implements
    VertexContainer {

  public static final String ALGORITHM_NAME = "distance";

  public static final String DESCRIPTION = ALGORITHM_NAME + ": The sum of the length of outgoing edges.";

  private double degree;

  /** Indicates whether degree needs to be recalculated. */
  private boolean dirty = true;

  public DistanceVertexContainer(GraphVertex vertex) {
    super(vertex);
  }

  @Override
  public void addEdge(GraphEdge edge) {
    super.addEdge(edge);
    dirty = true;
  }

  @Override
  public double getVertexMeasure() {
    if (getOutEdges() == null) {
      return 0;
    }

    if (dirty) {
      degree = 0d;

      for (GraphEdge edge : getOutEdges()) {
        degree += getVertex().distanceTo(edge.getTarget());
      }
      dirty = false;
    }
    return degree;
  }

  @Override
  public String getMeasureName() {
    return ALGORITHM_NAME;
  }
}
